Suppressed R15 Dirty Brass

Shooting my Gemtech equiped Bushmaster yesterday for the first time I was using brand new 55 grain FMJ Remington/Federal ammo and after being fired the brass was filthy. I have never seen once-fired brass so covered with black powder residue, the outside of the cartridge case was almost the same color as the inside. Is the extra gas blow-back is causing the issue or is this common for the AR or do I possibly have a problem with this rifle? TIA

95% of the crap coming back in a suppressor gun is coming down the bore - not through the gas tube.

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Yeah, I guess you're right. I guess the only reason I noticed it with ARs and not with other rifles is because, like you said, it's coming back into the shooter's face through the charging handle opening.

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